COMPARATIVE ANALYSIS OF METHODS OF MEASURING ADHESION OF REPAIR SOLUTIONS FROM DRY BUILDING MIXTURES TO CONCRETE SURFACES
DOI:
https://doi.org/10.31650/2786-6696-2023-4-41-48Keywords:
repair solutions, dry construction mixes, repair system, contact layer, adhesion.Abstract
The article provides a general assessment of the adhesion strength indicators of polymer-cement repair composites to the concrete base and determination of the degree of repeatability of test results when changing the methods of its measurement in accordance with Ukrainian and European standards.
During experimental studies, data were obtained on the adhesive strength indicators of the same cement samples of repair mortars based on dry building mixtures for the repair and restoration of concrete and reinforced concrete structures and buildings under equal conditions using different measurement methods, a distribution was obtained by the received classes of repair composites, taking into account the requirements of both standards according to the indicator of adhesive strength.
The obtained data show that according to the measurement method according to the Ukrainian standard, the vast majority of the examined samples of repair mortars based on dry construction mixtures showed similar measurement results, which indicates a high repeatability of the results of the measurement method. Also, a high percentage of adhesion loss according to the AF-S and CF-S classes and the number of structural classes among the studied composites remain among all the studied samples.
The European measurement method on the same samples and reference concrete slabs showed a significantly higher number of samples with a deviation from the average adhesion index, a lower number of samples with a loss of adhesion according to the AF-S and CF-S classes, a lower number of structural classes of repair composites and, in general, has a significantly lower repeatability of measurement results.
It has been established that some of the repair composites, which according to the requirements of the Ukrainian standard correspond to the highest structural class of the repair material РМ1 based solely on the adhesion index, can be classified only as materials of the R3 class according to the requirements of the European.
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